沒有讀懂源碼以前，無腦試錯總是效率很低的！
1.thanos receiver報store locally for endpoint : conflict
接口返回的日志：
store locally for endpoint : conflict
code=409
thanos receiver上的debug日志：
2021-08-20_20:49:43 level=debug ts=2021-08-20T12:49:43.941114321Z caller=handler.go:351 component=receive component=receive-handler msg="failed to handle request" err="store locally for endpoint : conflict"
2021-08-20_20:57:23 level=debug ts=2021-08-20T12:57:23.414813105Z caller=writer.go:91 component=receive component=receive-writer msg="Duplicate sample for timestamp" lset="{__name__=\"monitorid_73569379\", instance=\"send_client\", job=\"xxxx\"}" sample="unsupported value type"
2021-08-20_20:57:23 level=warn ts=2021-08-20T12:57:23.414856366Z caller=writer.go:135 component=receive component=receive-writer msg="Error on ingesting samples with different value but same timestamp" numDropped=1
原因是：短時間內，同樣的時間戳，同樣的監控項，上報了兩次
2. 不填寫sample中的timestamp
thanos receiver上的debug日志：
2021-08-20_20:44:49 level=debug ts=2021-08-20T12:44:49.190297867Z caller=handler.go:351 component=receive component=receive-handler msg="failed to handle request" err="store locally for endpoint : conflict"
2021-08-20_20:44:49 level=debug ts=2021-08-20T12:44:49.194313101Z caller=writer.go:94 component=receive component=receive-writer msg="Out of bounds metric" lset="{__name__=\"monitorid_73599067\", instance=\"send_client\", job=\"trpc\"}" sample="unsupported value type"
2021-08-20_20:44:49 level=warn ts=2021-08-20T12:44:49.194335493Z caller=writer.go:139 component=receive component=receive-writer msg="Error on ingesting samples that are too old or are too far into the future" numDropped=1